COMPARISON OF RESPONSE TO UNBALANCE OF OVERHUNG ROTOR SYSTEM FOR DIFFERENT SUPPORTS

Rotor unbalance is most common fault found in the rotating machines. Methods are adopted to analyze the position of unbalance and to bring its effect into acceptable limit. Vibration analysis is the most common technique used to analyze the rotor system. Research have been performed on rotor supported at both ends, however less study has been done for overhung rotor. In this paper the response of overhung rotor on isotropic support and anisotropic support subject to unbalance has been presented. Mathematical formulation is done using Finite Element method and equations are solved using MATLAB programming. The effect of unbalance has been studied on the bode plot. Forward and Reverse whirl are observed through Campbell diagram and mode shapes are plotted.